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Magnetically controllable wavelength-division-multiplexing fiber coupler.

Wei Lin, Hao Zhang, Binbin Song

|May 14, 2015

Summary

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A new magnetically controllable wavelength-division-multiplexing (WDM) fiber coupler offers tunable operation via magnetic fields. It demonstrates high isolation and wavelength tunability, suitable for fiber lasers and communications.

Area of Science:

Optoelectronics
Photonics
Materials Science

Background:

Wavelength-division-multiplexing (WDM) technology is crucial for increasing fiber-optic communication capacity.
Controllable fiber couplers are needed for dynamic WDM systems.
Magnetic field control offers a promising avenue for tunable optical devices.

Purpose of the Study:

To propose and experimentally demonstrate a magnetically controllable WDM fiber coupler.
To analyze the wavelength tunability influenced by magnetic field intensity.
To evaluate the performance of the coupler in terms of isolation and splitting ratio.

Main Methods:

Theoretical modeling to analyze coupling effects on wavelength tunability.
Experimental fabrication and testing of the magnetically controllable WDM fiber coupler.

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Measurement of wavelength tunability and isolation under varying magnetic field intensities (0-500 Oe).

Main Results:

The WDM coupler exhibits tunable operation across a magnetic field range of 0-500 Oe.
Optimal performance, including high isolation (>24.089 dB), is achieved between 25-125 Oe.
Wavelength tunability of 0.05 nm/Oe and 0.0744 nm/Oe was observed for the two channels.

Conclusions:

The proposed magnetically controllable WDM fiber coupler demonstrates high performance.
Its tunability, isolation, and stability make it suitable for fiber lasers, sensing, and communications.
Integration with magnetic fluid could enable magnetically controllable mode-division-multiplexing devices.